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jamieF

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Reply with quote  #21 
yeah 2 wire parasitic mode worked great on the breadboard and on a 20' test run  but failed when I got longer distances and multiple sensors.  phone line was dirt cheap so I saw no point in messing with it to try and get it working

stmbtwle

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Reply with quote  #22 
Sounds good.  Do you use the phone connectors as well?  I've been using shielded data cable, works great but pricey.  And I still need something heavier to run power to the fans.  Fortunately all my leads are short.
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Willie, Tampa Bay
jamieF

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Reply with quote  #23 
Yeah I have been just crimping them on as work had the tool although they're cheap to buy
.
stmbtwle

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Reply with quote  #24 
Sounds good I'll try it.
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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
jamieF

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Reply with quote  #25 
I've been playing with the collector today and I'm wondering if I'm going to have a flow issue with my hizer design.

here's a picture of the layout.  I want inlet and outlet on the same side of the panel.   Basically I have cold come in, split into two risers, travel across the panel, go back  via 5 or 6 risers and then down the other header.   risers are 1/2"  headers are 3/4"

Now that I'm looking at it I'm wondering if the majority of the flow to the outlet will go across the bottom riser and the top ones will basically sit there stagnating?   any suggestions on if this will be an issue and how to best adjust it.   
hizer design.png 


I suppose I could flip the entire thing and have the inlet/outlet at the top of the collector then adjust where the outgoing temp sensor is.  that would at least ensure that hot is always moving up. 

jamieF

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Reply with quote  #26 
Something more like this?    I'd have the outgoing exit the top of the collector and then just drop down and connect to the line in the back.  A bit crappy as it's outside of the insulated box but an easy enough change to makehizer redesign.png

Now I'm concerned about how it's going to drain back...  inlet outlet on the same side is a bit of a pain [wink]  

solardan1959

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Reply with quote  #27 
Jamie,
just take one line and go along the bottom, up the left side, and tap it into the upper left corner.  Return will be lower right.

Dan
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Reply with quote  #28 
Quote:
Originally Posted by solardan1959
... just take one line and go along the bottom, up the left side, and tap it into the upper left corner. 

That would be the outlet line, right?

Mike 


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Both temperature rise and airflow are integral to comparing hot air collectors
ChrisJ

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Reply with quote  #29 
http://www.builditsolar.com/Projects/SpaceHeating/28ftHizer/24'HotWaterPanel_sep26-1.pdf

On Steve's hizer panel look at the pic with no glazing on page 6. The pipe that runs from top right corner is his return pipe.

It goes the full width then 90s down to bottom left. 

That way the water enters the collector piping bottom left to left manifold and exits right manifold top right.

All is pitched to the left for drain back.

Could you eliminate the top pipe and have your 3/4" return pipe go left to right and 90* down next to the right manifold?

ChrisJ

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SolarInterested

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Reply with quote  #30 
Quote:
Originally Posted by ChrisJ
http://www.builditsolar.com/Projects/SpaceHeating/28ftHizer/24'HotWaterPanel_sep26-1.pdf

On Steve's hizer panel look at the pic with no glazing on page 6. The pipe that runs from top right corner is his return pipe.

It goes the full width then 90s down to bottom left. 

That way the water enters the collector piping bottom left to left manifold and exits right manifold top right.

All is pitched to the left for drain back


or as Steve writes

"Water gets pumped in at the bottom left of the panel, fills the tubing and exits the pipe array from the top right. The water return pipe is routed inside the panel—there is no point in running it outside where you can lose heat. You can see the exit pipe sticking out the bottom at the extreme left in the picture above. Since the return pipe inside the panel is painted black, it doesn’t reduce the panel’s effective area"

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Both temperature rise and airflow are integral to comparing hot air collectors
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